Typewriting machine



F. H, ARMSTRONG.

TYPEWRlTING MACHINE.

APPHCATION FILED OCT. 3, 1918.

1 ,4 1 9, 1 96 Patented June 13, 1922.

2 SHEETS-SHEET l.

Quorum; 0

F. H. ARMSTRONG" TYPEWRITING MACHINE.

APPLICATION FILED OCT. a. 1913.

Patented June 13, 1922.

-2 SHEETSSHEET 2.

Ill-l 164 M 25M n7 FRANK RUBBER-T ARMSTRONG, OF AUBURN, NEW YORK, ASSIGNOR TO CORONA TYPE- WRITER COMPANY, INC., 013 GROTON, NEW YGRK, A CORPORATION OF NEW YORK,

TYPEWRITING MACHINE.

ament.

Specification of Letters Patent. 7 P t nted June 13;, 31322.

Application filed October 3. 1918. Serial No. 256,685.

To all whom it may concern Be it known that I, FRANK H. ARMsTRONG, a citizen of the United States, and resident of Auburn, county of Cayuga, and State of New York, have invented certain new and useful Improvements in Typewriting Machines (Case #138), of which the follow ing is a specification.

This invention relates more particularly to line spacing means for visible typewriting machines.

One of the main objects of the invention is to provide simple and efiicient means for line spacing the platen for typewriting machines, the spacing mechanism being so constructed that it serves to lock the platen against rotation at the end of each line spacing movement to prevent over-running of the platen, and to insure accurate spacing between the lines of typewriting.

Another object of the invention is to provide a line spacing means wherein the line spacing pawl in its normal or at-rest position will be out of engagement with the line space ratchet wheel, whereby the platen may be readily turned in either direction through the finger pieces or knobs.

Another object of the invention is to -pro vide simple and efficient means for varying the extent of the line spacing rotation of the platen.

A further object of the invention is to simplify and improve the line spacing mechanism, and to construct the mechanism of simple parts, which may be readily and accurately assembled.

In the drawings, Fig. 1 is a plan view of one end of a platen carriage and platen, showing the line spacing mechanism in p0- sit-ion;

"Fig. 2 a. front elevation of the parts shown in Fig. 1;

the line space pawl engaged in theline space ratchet wheel; Fig. 9 a plan view of the parts, as shown in Fig. 8;

Fig. 10 a detail view of the spring-sup ported roller for holding the line space ratchet wheel; f

Fig. 11 a detail vertical sectional view on the line XIXI of Fig. l; and

Fig. 12 a detail front elevation of a slightly modified form ofthe index device.

Referring to the various parts by numerals, 1 designates the left-hand end of the platen carriage; 2 the carriage end bracket, and 3 the platen, suitably journalled in said bracket. The end of the platen shaft is provided with the usual finger piece or knob at, by which it may be freely rotated in either direction. Suitably secured to the platen end or to the platen shaft, as desired, is a line space ratchet wheel 5, having its teeth on the periphery thereof in the usual manner, as indicated in the drawings.

The end bracket 2 is formed at its forward edge a short distance above the carriage bed with an inwardly extending pivot bracket or lug 6. Pivoted at the right-hand end of the lug G is a line space lever 7, said lever being formed with the upwardly extending operating arm 8, and with the outwardly and downwardly extending part 9. The line space lever at a point at the lefthand side of its pivot and substantially in the same horizontal plane as the pivot is provided with a rearwardly extending yoke 10, the inner or rear end of which is bent inwardly toward the right to form. the pivot arm 11. The inner end of this arm is pivoted to an inwardly bent pivot lug 12, formed at the rear edge of the carriage end bracket 2, as clearly shown in Figs. 1 and 4 of the drawings. The pivot arm 11 is formed on its upper edge with a forwardly extending stop lug 13, which is adapted to engage the inner surface of the end bracket to form a stop for the line space lever, as clearly shown in Figs. 1 and 4; of the drawings. The yoke 10 is formed with a depending lug 14, to which a spring 15 is connected, the other end of said spring being secured to a suitable lug on the carriage bed. Said spring normally holds the line space lever in its normal position with the stop 13 against the carriage end bracket, and returns it 'to that position when the line space lever is released after a line spacing operation. The operating arm. 8 of the line space lever is provided at its upper end with a curved finger piece 16, which is adapted to be grasped when moving the line space lever to the right in the line spacing operation. It is to he noted that the movement ofthe line space lever in the line spacing operation is toward the right-hand side of the machine, and therefore is in the proper direction to return the carriage to the proper point for the beginning of a new line of printing. It is manifest that by providingI the yoke 10 and the inner bearing arm 11 thereof, the line space lever is strengthened and supported in such manner that it will move accurately and withstand a great amount of the necessarily rough usage which a line space lever is subjected to.

Pivotally secured to the inner side of the downwardly and outwardly extending part 9 of the line space lever and at a point below the line space lever pivot is a line space pawl 1.7 said pawl normally extending upwardly and inwardly 01' toward the righthand. The upper inner end of this pawl is turned outwardly and then downwardly to form a hook 18, adapted to loosely embrace the upper arc-shaped edge 19 of the line space lever, as clearly indicated in Figs. 1 and 2 of the drawings. The line space pawl at a point near its pivot is formed with a laterally extending arm 17 to which is connected one end of a spring 19*, the other end of said spring being connected at 20 to the line space lever. The spring 19 normally throws the inner end of the line space pawl downwardly, and holds the substantially vertical edge 1'? of: the said pawl against the outer surface of the yolre 10, as shown clearly in Fig. 11, the said yoke 10 serving as a stop for the line space pawl. The outwardly turned hook 18 serves as an abutment to limit the movement of the "line space pawl in the line spacing operation, as will be fully hereinafter described. The line space'pawl is formed on its upper surface substantially midway its ends with a rearwardly extending substantially horizontal tooth-engaging portion or nose 21, whose inner end is stepped to form an abutment or projection 22, adapted to be brought into engagement with the outer ver tical flat surface of the ratchet wheel, the leading edge of the nose 21 being close to the side of the said ratchet wheel, and in a position to be brought into engagement with the teeth thereof through the movement of theline space lever. p

Pivoted to the outer surface of the line space lever on the pivot screw 23, which connects the line space pawl to said lever, is the lower end of anindex device or regulating lever 24. On the upper end of the lever 24 is pivoted an index or throw-regu' lating dog 25, said dog lying on the outer face of the line space lever and extending inwardly toward the upper end of the line space pawl. The index dog is formed with an inwardly extending locking lug 26, which is adapted to enter any one of a series of three index notches a, b, and 0, formed in the upper wallof a segmental slot- 27, formed in the line space lever. The index dog is formed at its inner end with a depending arm 28, adapted to receive the upper end of a spring 29, the lower end of said spring receiving a finger 30, extending upwardly from the lower part of the index lever, said spring normally throwing the index dog upwardly and holding the locking lug 26 in one of the index notches of the segmental slot 27. The upper outer end of the dog 25 is bent forwardly to form a finger piece 31, by which the said dog may be manipulated, said finger piece and the dog forming abutment adapted tocontactwith the hook 18 of the line space pawl at the completion of the line space movement, as indicated in Fig. 3 of the drawings. The index notches are so placed with respect to the at-rest position of the line space pawl that the abutment 18 willengage the'stop 31 when the line space pawl has engaged and moved the ratchet wheel the desired number of spaces. The index dog may be depressed against the tension of the spring 29 to free the locking lug from the index notch with which it is engaged, and then the index lever may be swung in the desired direction to bring the locking lug into register with the desired index notch.

The pivot screw 23 is formed with a shoulder 23, on which the index lever is mounted; and a shoulder nut 23 is threaded on the inner end of the screw, said nut forming a bearing for the line space pawl. It is manifest that the operative movement of the line space pawl will be in a direction tending to tighten the nut on the screw. It is manifest that any suitable form of pivot mounting may be used for the index lever and the line space pawl. It is preferred, however, that the pivotal points of said lever and pawls shall be axially in line.

It is thought that the operation of the de vice is manifest from the foregoing description, but it may be briefly stated as follows: By placing-the locking lug of the index dog in the innermost index notch, marked d, the abutment 31 and the end of the index dog will be brought close to the abutment 18 of the line space pawl. The parts will then be in position to give the platen a movement of one tooth of the line space wheel. A complete movement of the line space lever to the right will first cause the toothengaging portion or nose 21 of pawl 17 to enter between two teeth of the line space wheel below the center of the platen, the

bracket of the carriage.

shoulder 22 engaging the vertical outer side of said wheel, as shown clearly in Figs. 8 and 9. The continued movement of the line space lever will cause the line space pawl to move upwardly and to rotate the ratchet wheel until the 1 abutment 18 and the index dog contact with each other, the two parts approaching each other during the movement of the line space lever, one swinging inwardly, and the other moving upwardly. When the ratchet-wheel has thus been rotated the predetermined distance, the continued pressure on the line-space lever causes the projection 22 on the line-space pawl to jam hard against the non-toothed face of the ratchet-wheel to thus cause a braking action on the ratchet-wheel, thereby preventing overthrow, no matter how sharply the line-space lever may be operated. Upon the release of the line space lever the spring 15 will return it to its normal position, the stop 13 engaging the end The spring 19 will return the line space pawl to its normal position, with the edge 17 in engage ment with the yoke 1.0. Figs. 8 and 9 show the line space pawl in engagement with the ratchet wheel, and Figs. 6 and 7 show its normal disengaged position. By placing the locking lug of the index dog in the index notch marked 6, the movement of the line space pawl will be sufficient to rotate the laten the distance of two ratchet teeth; and y placing it in the index notch marked 0, the distance between the abutment 18 and the dog 25 and stop 31- will be suliicient to cause the pawl to rotate the platen a distance of three teeth before said abutments engage each other.

A spring-pressed roller 32 is mounted on the carriage and engages the ratchet teeth to prevent accidental rotation of the platen when the line space pawl is free of the ratchet wheel. It is manifest however, that a the platen may be rotated by grasping the In Fig. 12, is shown a slightly modified,

form of the index device. In this construction of the device the index dog is formed with an arm 25", to which is connected a spring 29, the other end of said spring being connected to the index lever. The operation of this device is precisely the same as the device shown in the other views, the spring 29 pulling the arm '25 downwardly and throwing the index dog upwardly to enagethe locking lug in the index notches.

What I claim is p 1. In a typewriting machine, the combi-. nation of a platen carriage, a platen journalled in the carriage, a ratchet wheel rotatable with the platen and provided with peripheral teeth projecting from the body portion of the wheel in the plane of said body portion, a line space lever pivotally held to the carriage to swing transversely of the ratchet wheel, a pawl pivotally held to the lever to swing about an axle parallel with the ratchet wheel and having a nose adapted to engage between the teeth on said wheel and a limiting abutment adapted to engage one side face of the wheel, .an adjustable index lever pivoted on the line space lever, and a, stop carried by said lever adapted to be engaged by the pawl after a predetermined movement of the line space lever to arrest the pivotal movement of the pawl and cause stoppage of the movement of they line space lever and ratchet wheel through the medium of said nose and abutment.

2. Ina typewriting machine, the combination of a platen carriage, a platen journailed in the carriage, a ratchet wheelrota-v table with the platen provided with peripheral teeth projecting from the body portion of the wheel in the plane of said body portion, a line space lever pivotally held to the carriage to swing transversely of the ratchet wheel, a pawl pivotally held to the line space lever to swing about a different axis parallel with the ratchet wheel and adapted to engage between the teeth of the wheel and also frictionally engage against one side of the non-toothed body portion of the wheel,.an

adjustable index device pivotally supported on the line space lever to swing about the same axis as the pawl and adapted to be engaged'by the pawl, and cooperating means on said device and the line space lever for locking the device to the lever in difierent pivotally adjusted positions thereof.

3. In a typewriting machine, the combina tion of a frame, a platen, a ratchet wheel, a line space lever pivoted on the frame, a line space pawl pivoted at its lower end on said lever, and index device pivoted on the lever, the pivots of the said pawl and device.

being axially in line, and means for varying the at-rest position of the index device with respect to the line space pawl, the line space pawl being provided with a nose intermediate its ends adapted to engage the teeth space pawl having a nose adapted to engage the ratchet wheel and pivotally held to the line space lever, an index device pivoted on the line space lever on the same axis as the line space pawl adjustable toward and from the line space pawl, andmeans whereby the index device and line space pawl will engage each other and be jammed against the side of the ratchet wheel and thus bralrethe same as well as arrest the line space lever after a predetermined rotation of the platen.

5. In a typwriting machine, the combination of a platen carriage, a platen journalled in the carriage, a ratchet wheel rotatable with the platen having radially extending teeth, a linespace lever p ivotally supported on the carriage to swing transversely ofthe ratchet wheel, a pawl pivotally held to the line space lever to swing about a different axis extending parallel with the plane of the wheel, a pivotally adjustable indexdevice held to the line space lever at one'end to swing toward and from the pawl,cooperating abutments carried by said device and pawl at their free endsfsaid pawl being formed with a nose adapted to engage between the teeth on the ratchet wheel when the lever is moved in one direction, and said nose being provided with an abutment adapt-- ed to engage the outer face of the ratchet wheel when the nose moves into engagement with the teeth on the wheel and rock the pawl about its pivot toward the index device dur ing continued movement of the line space lever.

6. In a typewriting machine, the combina tion of a platen carriage, a platen journalled in the carriage, a ratchet wheel rotatable with the platen, a line space lever pivotally supported on the carriage, a pawl pivoted on the line space lever adapted to engage between the teeth on the ratchet wheel, a rigid stop formed on the free end of the pawl, an arm pivotally held at one end to the line space lever to permit its free end to be adjusted toward and from the stop on the pawl, a stop pivotally held to the free end of said arm adapted to be engaged by the stop on the pawl, cooperating means on the pivoted stop and the line'space lever for locking the stop to the lever in different adjusted positions, and a spring connecting the pivoted stop and arm for yieldably holding the stop in locked position.

7. In a typewriting machine, the combination of a platen carriage, a platen j ournalle'd in the carriage, a ratchet wheel rotatable with the platen, a line space leverpivotally supported on the carriage to swing trans versely of the ratchet wheel, a line space pawl pivotally held to the line space leverto swing about a different axis parallel with the plane of the ratchet wheel, a tension spring connected at its ends to the pawl and line space lever for normally forcing the pawl toward the ratchet wheel, a fixed stop on the lever for holding the pawl out of engagement with the ra-tchetwheebwhen the line space lever is in normal position, a tension spring connected at its ends to the lever and carriage for restoring the lever to normal position, and a fixed stop on the lever adapted to engage an abutment on the carriage to determine the normal position of the lever.

8. In a typewriting machine, the combination of a platen carriage,a platen journalled in the carriage, a ratchet'wheel rotatable withthe platen, a line space lever pivotally supported on the carriage to swing transve'rsely of the ratchet wheel, a line space pawl pivotally held to the line space lever to swing about a different axis parallel with the plane of the ratchet wheel,'a spring for norrnally forcing-the pawl toward the ratchet wheel, an abutment on the lever for swinging the pawl out ofengagement with the ratchet when the line space lever is returned to normal position, a spring for restoring the line space lever. tonoi'mal position, and c'ooperatingabutments on th'elever and carriage for arresting p the lever in normal position.

9. In atype'writing machine, the combina tion of a platen carriage, a platen journalled in the carriage, a ratchet wheel rotatable with the platen, a line space lever pivotally supported on the carriage and provided with a series or" index notches, a line space pawl pivoted on the lever, a spring connected to said pawl and lever tending to throw the pawl into engagement with the ratchet wheel, a fixed stop onthe linc space lever for holding the pawlout of engagement with theratchet wheel when the lever is in normal position, a spring for forcing the lever toward normal position, cooperating .fiXed stops on the lever and carriage for determining the normal position of the lever, an adpistable index device pivoted at one end on the lever to swing'toward and from the pawl, and means for locking the index deviceto the lever indifferent pivotally adjusted positions in pathof pivotal movement of thepawl. i

10. In a typewriting machinc,"the combination of a'platen carriage, a platen jour' nailed in the carriagepa ratchet wheel rotatable with the platen. a line space lever pivotall; supported on the carriage and pro vided with a series of notches. a pawl pivotally held to the lever adapted to engage the teeth of the ratchet wheel, an arm pivotally held at one end to-the line space lever, a spring-pressed dog pivotally held to the free end of said arm adapted to be engaged by the pawl, and means carried by said dog adapted to engage in. any one of the notches in the line space lever to lock the dog in different adjusted positions.

11. In a typewriting machine, the combination of a platen carriage, a platen journalled in the carriage, a ratchet wheel rotatable with the platen, a line space lever pivotally held to the carriage to swing transversely of the ratchet. wheel and provided with a series of index notches, a pawl pivotthe wheel and also abut against one side of the wheel, anarm pivotally held at one end to the lever to swing about an axis coincident with the pivot of the pawl, a spring-pressed index dog pivotally held to the free end of said arm and having a projection adapted to engage in either of the notches in the lever, said dog and pawl being adapted to engage each other to arrest the line spacing movementof the lever and paw]. and cause the pawl to lock the ratchet wheel against overthrow.

12. In a typewriting machine, the combination of a frame, a platen, a ratchet wheel, a line space lever pivoted in said frame and provided with a rearwardly extending pivotal yoke, a linespace pawl pivoted on the line space lever, a spring connected to'said pawl and to the line space lever and holding the pawl against a stop on the lever, a stop formed'on the line space lever near the rear end of the yoke and adapted to engage a rigid part of the frame, a spring connected to the line space lever and to the frame, and an index device pivoted on the line space lever and adapted to be adjusted toward and from the line space pawl to limit the movement of said pawl in the line spacing operation. I

13. In a typewriting machine, the combination of a frame, a platen, a ratchet wheel secured thereto, a line space lever mounted in said frame and provided with a rearwardly extending bearing yoke, a pivot for the rear end of said yoke, a stop carried by the rear end of said yoke and adapted to engage the carriage frame to determine the at-rest position of the line space lever, a line space pawl pivoted at its lower end on the line space lever and having a nose adapted to en gage the ratchet wheel, and provided at its upper end with an outwardly turned hook adapted to engage the upper edge of the line space lever, an index device pivoted on the line space lever and adjustable at its free end toward and from the line space pawl and adapted to engage the outwardly turned'hook of the line space pawl to lock the line space lever and the ratchet wheel when the platen has rotated a predetermined distance.

14,-. In a typewriting machine, the combination of a frame, a platen, a ratchet wheel, a line space lever pivoted in said frame and formed with a curved edge, a line space pawl pivoted on said lever and formed at its upper end with a shock adapted to engage the curved upper edge of said lever, a spring connected to the said pawl and to the line space lever to normally hold the pawl out of engagement with the ratchet wheel and against a stop on the line space lever, and an adjustable index device carried by the said lever and adapted to be moved toward and from the outwardly turned hook on the end of the line space lever.

15. In a typewriting machine, the combination of a line space ratchet wheel, a line space lever, a line space pawl pivoted on said lever having a tooth-engaging nose and formed at its outer free end with an abut: ment or stop, a spring connected to said line space pawl and adapted to hold it against a stop formed on and swinging with the line space lever, whereby the line space pawl will move with the line space lever until the nose has engaged the ratchet wheel and will then have a pivotal movement with respect to said lever, an adjustable index device pivotally mounted on the line space lever and adapted to be moved at its free end toward and from the free end of the line space pawl, and serving as a stop to limit the pivotal movement of the line space pawl with respect to the line space lever after a predetermined movement of said lever.

16. In a typewriting machine, the com bination of a platen carriage, a platen journalled in the carriage, a ratchet wheel rotatable with the platen, a line space lever provided with a pivot yoke extending trans versely of the carriage, means pivotally connecting said yoke at its ends with the carriage, a springconnected to said yoke and the carriage for normally swinging the lever outwardly, a fixed stop on the lever adapted to engage the carriage to arrest the lever in normal position, a line space pawl pivotally held to the lever and normally held out of engagement with the ratchet wheel by said pivot yoke, and an index device pivotally held to the lever and adjustable about its pivot to different positions in the path of pivotal movement of the pawl.

17. In a typewriting machine, the combination of a frame, a platen, a ratchet wheel, a line space lever pivoted to the frame in front of the ratchet wheel and extending upwardly, a line Sp ce pawl pivoted to said lever and extending upwardly and inwardly, the upper free end of said pawl forming an abutment, said pawl having a rearwardly extending portion intermediate its pivot and upper end adapted to engage the ratchet teeth and the outer vertical face of said wheel, and an upwardly extending index device mounted on the pivot of the line space pawl and adjustable at its upper end toward and from the upper end of the line space pawl and adapted to be engaged by said pawl to lock the ratchet wheel and the line space lever when the ratchet wheel ha-s been rotated a predetermined distance.

18. In a typewriting machine, the combination of a frame, a platen, a ratchet wheel, a line space lever pivoted to the frame in front of the ratchet wheel and extending rearwardly extending portion intermediate its pivot and upper end adapted to engage the ratchettceth and the outer vertical face of said wheel, an upwardly extending index device mounted on the pivot of the line space pawl and adjustable at its upper end toward and from thoupper end of the line space pawl and adapted to be engaged by said pawl to lock the ratchet wheel and the line space lever when the ratchet wheel has been. rotated a predetermined distance, a

spring connected to the line space lever and to the frame to return said lever to its at rest position, a stop to define the at-rest position of said lever, a spring connected to theline space pawl and to the line space lever to return said pawl to its at-rest position, and a stop carried by the line space lever and adapted to define the at-rest position of the line space pawl.

19. In a typewriting machine, thecombination of a frame, a platen, a ratchet wheel, an upwardly extending line space lever pivoted to the frame to swing toward and from the ratchet wheel and provided with aseries of index notcheaa line space pawl pivoted to said lever and extending upwardly and 1nwardly, the upper free end of said pawl forming an abutment, said pawl being provided with a rearwardly extending portion adaptedlto engage the ratchet teeth and the outer vertical face of said wheel forward of the axis of the wheel, and an upwardly extending index device mounted on the pivot of theline space pawl and carrying a yieldvable dog adapted to engage in either one of the index notches in the line space lever and adapted to be engaged by the line space pawl to lock the ratchet wheel and the line space lever when the ratchet wheel has been rotated a predetermined distance.

20. In a typewriting machine, the combination of a frame, a platen, a ratchet wheel, a line space lever pivoted on said frame in front of the ratchet wheel and formed with a rearwardly extending horizontal pivot yoke, a bearing in the frame for the r-ear end of said yoke. a stop carried by said yoke and adapted to engage the frame, a spring connected to said yoke and to the frame to hold said stop against the frame, said line space lever extending upwardly and outwardly fromits pivot. an upwardly and inwardly extending-line space pawl pivoted on said lever having a tooth'engaging portion normally free of the ratchet wheel, a spring connected to the line space pawl and to the line space lever and normally holding the line space pawl against the pivot yoke, and

an index device mounted on the pivot of the line space pawl and, extending upwardly therefrom and adapted to be swung toward and from the upper end .ofthe line space pawl to vary the line spacing movementof the said lever, y 7

21. A typewritin machine comprising a platen carriage, a line space lever pivoted thereto, a line space pawl pivoted on the said lever and formed with an outwardly turned hook at itsupper end to engage the upper edge ofthe line space lever, an index device mounted on the said lever and adjustable toward and from the outwardly turned hook of the line space device, said heel: and said index pawl being adapted to engage each other to limit the line spacing movement of the said lever.

22.. In a typewriting machine inwhich a roll platen is rotated for line-spacing by means of a swinging lever carrying a pawl adapted to engage the peripheral teeth of a ratchet-Wheel, means for causing the linespacing movement of the lever to apply a frictional braking force on the non-toothed face of the ratchet-wheel to thereby utilize the line-spacing movement to prevent overthrow of the platen.

23. In a typewriting machine in which a roll platen is line-spaced through the medium of a manually-operable member carry-1 ing a line-spacing pawl engaging a ratchetwheel carried by the platen, said platen and said ratchet-wheel constituting a rotatable structure, means whereby the line-spacing movement of said member is utilized to apply a frictional braking action upon a nontoothed face of said rotary structure.

24:. Inatypewriting machine, the com bination of a platen carriage, a platen journalled in the carriage, a ratchet wheel rotatable with the platenand having periplr.

gage the outer side face of the wheel, and an index device pivotally held at its lower end to the line space lever to permit adjustment.

of its upper end toward and from the upper end oft-he line space pawl, the upper end of the pawl being adapted to strike the upper end of the index device to limit the line spacing movement of the lever and pawl and lock the ratchet wheel through the medium of the nose.

25. In a typewriting machine, the com bination of a platen carriage, a platen,

journalled in the carriage, a ratchetwheel rotatable with the platen and having peripheral teeth, a line space lever pivotally sup ported on the carriage to swing transversely of the wheel and provided with an upwardly extending operating arm, a line space pawl pivotally held to the lever at the outer side of the pivot of said lever and extending upwardly and inwardly from its pivot toward the outer side face of the ratchet wheel, said pawl having a rearwardly extending rigid nose normally tree of the wheel and adapted to move into engagement with the teeth of the wheel below and forwardly of the axis of the wheel, said nose being provided with a projection adapted to engage the outer side face of the ratchet wheel, an index device pivotally held at its lower end to the line space lever to permit its upper end to be adjusted toward and from the upper end of the pawl, and means for locking the upper end of the index device to the lever in different adjusted positions in the path of movement of the upper end of the pawl.

26. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a ratchet wheel rotatable with the platen and having teeth formed on its periphery, a line space lever pivotally supported on the carriage to swing transversely of the wheel, a pawl pivotally held to the lever to swing in a plane at right angles to the plane of the ratchet wheel, said pawl being provided with a nose adapted to engage the teeth on the wheel and having an abutment adapted to engage a non-toothed side face of the wheel when the nose is in engagement with the teeth on the wheel.

27. In a typewriting machine, the combination of a platen carriage, a platen rotatably mounted on the carriage, a ratchet wheel rotatable with the platen and having teeth formed on its periphery, a line space lever pivotally supported on the carriage to swing transversely of the wheel, a pawl pivotally held to the lever to swing in a plane at right angles to the plane of the ratchet wheel, said pawl being provided with a nose adapted to engage the teeth on the wheel and having an abutment adapted to engage a non-toothed side face of the wheel when the nose is in engagement with the teeth on the wheel, and an adjustable index device carried by the line space lever and adapted to be locked thereto in different positions in the path of movement of the pawl.

This specification signed this 24th day of September A. D. 1918.

FRANK HURBERT ARMSTRONG. 

